code: def test_multiple_nans(self):
      primitive_func = self.primitive().get_function()
      array_nans = pd.concat(
          [self.array.copy(), pd.Series([np.nan] * 3)]
      )
      assert primitive_func(array_nans) == (8 / 13.0)
      primitive_func = self.primitive(skipna=False).get_function()
      assert primitive_func(array_nans) == (9 / 13.0)
  
file_path: featuretools/featuretools/tests/primitive_tests/transform_primitive_tests/test_percent_unique.py
imports: import numpy
  import pandas
  from featuretools.primitives import PercentUnique
  from featuretools.tests.primitive_tests.utils import PrimitiveTestBase
label_desc: Use image node_id 3 for calling the TestPercentUnique obj's underlying member method code with example usage: obj.test_multiple_nans() without return types